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Amateur satellites orbit the Earth at a height of about:
50km
150km
1500km
50000km
Most amateur satellites:
orbit around the equator
are in a fixed position over the North Pole
orbit on a path that takes them over the same track on every orbit
Orbit on a track that passes close the North and South pole on each orbit
In general amateur satellites
transmit and receive on the same frequency
transmit and receive on different frequencies within the same band
transmit on one band and receive on another band
transmit on the HF bands and receive on the VHF bands
The apparent frequency of a signal from a satellite will change so that
as the satellite approaches, the received frequency increases
as the satellite approaches, the received frequency decreases
as the satellite moves away from a receiving station the received frequency increases
the greatest shift in frequency is when a satellite is overhead
To conserve a satellites power transmitting stations should
use the highest power possible
use the least power possible
use any power they have available as the satellite on board system controls the power demand